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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf2e051c7a6d11036e299d6d02413d1129252c4371ae1d32bed81d68b885eee' 
  AND token = 'ifJ0+tB2xO+A+YI146zMXPfuC2BXUTKcv4+K8gj4WyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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