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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b66a735273abfd9bd3f8093293afa527f4344d38d259defca37b75458733bab' 
  AND token = 'KpLi2WrX0R84rhN4cuTyg2p7mtHq+2J2bz/atFGk57Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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