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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba88f25ce1c37abea1edf0512fb1b877330770a0fd9280bc3f18036e0f589404' 
  AND token = 'PhGrw8kKwU6LDioG5v19eD/3Jto61WTkHMI8b1oo3MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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