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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7303c58c15f574ad745edd10c8a48904976a7c277a522d8e7da3f9400e0068' 
  AND token = 'w6YV+neylwPgVeg+p+UYSdQjZnyeC2aZ4b4+mPx7irU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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