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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034c1146848ba8be86e09ad1386c3a4c7f2b81d4053fb7047736821f6a59550d' 
  AND token = 'jRk0b6Gj1FllbOCJib4oCTocV6C2cXVMNGj3SNgG4po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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