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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917baa1cd7fed6bc7099b56ad3d34a70dc4133b01aabc3af20984bc0f5aec216' 
  AND token = 'S0db1e/KH6ukdHNKY/E6oSWq/n4Vp9l8HRcrTE8Ifa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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