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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d11a62e7456c5daa4cb240e64ee33d1d13a289eb5026980a3d2b4ff208a88b6' 
  AND token = 'uBFRlAaUlZC3tWkU6MFjlzCcLU/248zL68ozsdCTt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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