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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a4a2e91b2092b77183b76c67fac68662bc0770f43f20ab7322aa5b2841147f' 
  AND token = 'AeSx9jlz5thsubjC9djf4+SS1OjCNlqLS3UfZsbRvto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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