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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b750048d5a1c71ef7e9f92dffcb29b87645c5fcb81d750dc21cf1e7e5ab98' 
  AND token = 'cFhUAPN6O+i8xDNinOo5o269J2HVQ8xoxWhQV+51M24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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