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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62b15e081e43d510aa35fa668b42ae95d5531a67265ef8c866fd1ea33236d85' 
  AND token = 'J5S/9J0X92urEU1zO/i7Rr+otnxxYTMXfmw/mb1AZsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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