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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefab94108fbd965ff74f3ece45275d25246aa406b60cd680b4e3f9caaf03584' 
  AND token = 'LLWu/Dzi9sBM5FBMm4go3967o5Bzge2GM50ONvLWZEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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