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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40c3e623fb9b39c9ddc949eeba09213b6f898f310b7123480fbae210bb26d9a' 
  AND token = 'u1AWzJVPjgOtgtZ6IJM7EBy6AHSbDiv3wYPzI8/LNpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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