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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089465a9b9421fc7c3fc0c819e04cb2986bb1215884da81402372d211d2e9494' 
  AND token = '9xy2HY4eY2e/AduCd9auOmsdUAXX8qA6XTRYNL/COj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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