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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b19fb1e75b7c1f532d4abe81d0e087231f5528e434f89cf39e7cefb67d815b7' 
  AND token = 'a6izcOziy93LyKMECpicdrXDnSg4M1VuAVl48Fe+PPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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