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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b198f309b72c5087dee8f00b86cedbde0a664d2600c36506685b95fe51c03bd' 
  AND token = 'lkAoBVUW/qN/cVxnwrMiUotB61PEBWIkoarpfr1WnQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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