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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae6e1563999b3b0c2ab0e5d18c407fa161978a8cae61e2b2b2472545b375e12' 
  AND token = 'DhFZkO6uGu7TWrX17Og2TaN8RPiDSgR60Dn1rSMkkIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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