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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71d542bc9ad15a19d0de28cf3e3a2b22b53e8d0e62d086b2e9ab61accaa3af6' 
  AND token = 'ERGfZpxW617kk41395mDDcg0Sr95jmmmm61MbyPT6fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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