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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a167172662ae7890c633f9436372c698a211a94f5fac59021ce5d33ecd330a5' 
  AND token = 'bCiNT8WNNmlHGrzlgNiytDUXYD5PHT3BCEw0FzCLfsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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