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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca8b8b631e5227df0f332072bb1542403537926b3ae7bf97e0565d825d36ce7' 
  AND token = '2L60u53sHOemLpo+oEQpfKai5NM8En84WvkPkxGU5KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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