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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d08b94741b3053350a3d725eb7ec60a044b7b6124481e3ceb7e70d9a73c4956' 
  AND token = 'ycKIXC0e7VTfPWIvxvSN/fr4sTCe7zaII7P1n2z5eUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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