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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db78dbf81416aa43fbca8be8823e7eb4aa9d735b2ccae42653f2cd9fc808dbe2' 
  AND token = 'zc9ThtWSLDmjP66CiLDNX7anzCPch0jMX7aumzarjP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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