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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771a44ee816e860ae4493bd0fe6cecef02824f469a1060768d32c1abcbb66ed7' 
  AND token = '+Y+lTS4/FAUZCksdj1c+ctVmRzvJg8FS0G+XqkliJu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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