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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a064e29342c85559290bb60bdc63cff2991f2f8c9bb319b099b66bb0e3334b' 
  AND token = 'Q2jkp65ziWy2xWcde3dD4Ykridxe5jD9FM+uBH2RKgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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