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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdcca6d4f87c77cbec7b62764575a951a156ab74e2a167a1929cf84a70ef0b8' 
  AND token = 'rsTpKOwSkg1k2yoNJW2p1cE3GT3KDTLPyMpIqGMmdhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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