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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a18c087cb3089da7efb31c944d50d2aa6092ff165e93a323508bd2fcd92b7a' 
  AND token = 'Cll/jmowPItsR3tOhxTS5bAUw7NcUczMBfVWhwtaaao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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