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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299fc81d6257634b2ec7baac7bfaa4783be8610e22a501a8c5a146a7e93582fa' 
  AND token = 'YmyFH4NXfF04ZdwyE1W4+Sfiz1o6EMix8+IcdG8+A7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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