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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8262bec6ba19836e55ce969808e4c7cae14bff69a0340697a2c64a8cd0965c0e' 
  AND token = 'hvUE9ULKljK8v78867HOPI6x3kydHI+wqB32zv3ytys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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