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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99009da3c6e69d3f388485ee016fdf0a733041c77fc0b28d27e9f7d0ef31c1a' 
  AND token = 'Q++eG/J+V8ejCIHkb35AHaKGlNzf4QxIVKazV7KoamA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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