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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6619c78bed45fd709d829c77358a896fda867452c12479b53134e150b23e38' 
  AND token = 'vZPRpTtKmnrC2kCXwtSrk+3dViWphf1Dh1l17uTWk1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}