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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b88c2f2e699b7427dae7a0c60cede3924bda1b8b792158ee1eec99e19e3c1f8' 
  AND token = 'elVMRqDWzDdd47zgdX29CTrf2VRrAviZuGnbY5lcdPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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