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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908b8cd5082da7173e6f24e62f7c94c201e653edc1a71060efe1605fc0f016e5' 
  AND token = 'Z0nI9Cta1TQCpgQKh216iJrOKGJitLgjnw8Gb0l+/8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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