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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d538ee1a8f71b7363c40d652949d24b2e261517eb1e53585600b4eb43584c7' 
  AND token = 'p1lzDTgATKq45GSld9uI4NS5gyPeYq+qhp2d9QVzvGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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