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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d9d2403cabcb998a480e2ee8d1cbc093780d71215f99cda23d88cbdcab2437' 
  AND token = 'QbmT1G+HP0WY2W0EmtScd3QK11I5GWSa9U7OUoJJNec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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