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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15d079096109956112db8f4da418a7d9dbb02cc4101f8e231ce365280239b0d' 
  AND token = 'l3IkJFhF8VP57uqQCs6pnwsk8jaJkPOou5Eto+Zfgg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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