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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c17b0cbc103a136c6ef19294ea9e2a12eefb7d9a88a23aaa22e691ca1baa933' 
  AND token = 'XJuDeHCmPsN7HKiFvS0IdW+ESPNbqTIw3z9MocA85jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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