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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3082d5c16d737ae4ca80669af15e837f98a654775d16de2f022664c7a00c3da' 
  AND token = '/FuS9KQAxV1X8OqJSrGcxEwG1U1rkd+a8ALtOjX9PsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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