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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393b243dc80fb5b9e18f594cf494e4f8621c7dbf5bc8aca7bc30b78fbfb99612' 
  AND token = 'hyRlc9r3hcPqBtwxv2JPHVKX82Z5tC4IQdfd8HV0q/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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