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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76d329ab41fa479a32f9d7ef382acbc5c9ff72146f66b453851bc79c0a04966' 
  AND token = 'mJSdGfQR3hX86S9t6rObjacMcO3IJw2xM0rltMa8ujM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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