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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a751d26d5f62665b84e3f8350050691e65a2270867df9af0d21f21165d07be53' 
  AND token = '0mmkenrcSOp1sQilalLD3FBdjBEO6Lf/+Jdi8FM8AsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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