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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9c348011ce3a7521984191fb045d5476f0797a6b6b3df7775f5a9d9f7e505a' 
  AND token = 'WhBo8egKbj8q/XjXP9dehowrNMAp4V+oeewzIZeceB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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