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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3453295aea8b392b1658d193a6153ad6b451be9a60ce520922cd2dddb69a37f' 
  AND token = 'qTvcYbz1/gsVEOje+4RuzSScXncXz2j2Y8/A/6q5mzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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