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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee7fbdf7a0aedcf005f26114e36ee875f8fd6ac4511fc4ce7fb72aa16f60429' 
  AND token = 'kOTNvyCfVtqDK91tWbq10DcdPaM1Qd3cwbRgnPqfxHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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