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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e9203cb3f3d87291e344ab45de8cab2e0e47bd410b73ff3ad8a5aab6e4f85d' 
  AND token = 'eERVasptBgwBzcUrbC4rc4WVBgB5CVGHBey/p35Y5B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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