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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46dc4a0f46232e41c785dcd11fcd89c0fd1b53be513f8ec6c9f05a3df0ea4c1' 
  AND token = 'TYcXrlkPRg4bySe4k6/vgZgfGzkGuXqHIaYAF7HQr2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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