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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd2a95a11a1aecf3ebb71e4c823e1b543d8bf00a7e3d5240513ac5f6b8f43df' 
  AND token = '8tWgiouyKejlEBcp2nYRl9DTLpjL0GYtxbMe/MmkflE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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