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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a769a0bf85eecc2ae6e70daaafe174f0c3f933509d6810f90758a003017b84' 
  AND token = 'nTgfgntz+4x/ZcWl3hGL2PzwlS6jzz+fmMxsuyQXmS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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