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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c304a8ae2c5725381b656c4d05f11c68c7efffa845f3bffcb8e05e5201da82be' 
  AND token = '94T6dF87R8DwbnZPs0vPKdXHV40xTFgYfO3SHjVAV38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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