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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd4452b03fa81894fe754eb54d4b5a17fa2f8a0b4ebf5ce0f0771a23c72f965' 
  AND token = 'VRi8bUnzv+bCpEyB1bw1hjY0jNdkzUE7i/TzQwD5FRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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