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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caab952b138189ec886c8fed317381e77b67e7c30c36b6e73c4dc58f36904338' 
  AND token = 'DiPUWi7c+axmEGq0i6KUyD5S9XrioKQUaNpfpoej9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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