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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae270e5537a48a57a903f166d462e68239c0d74263808e1115b6adf370f19d88' 
  AND token = 'ulWI7EEIUBoqe19J7kCGglzRHs2ySJQ4uXz2kjkBH+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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