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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0162ac993ee2aa9a05199bb20acb543009a4604731e7c57b5df3ece46414b1' 
  AND token = 'aeohkOn3WDnspHcEdo8K1BMtMrJZ9Blv751ao2xH+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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