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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be313fda6c5cef0e48e1dee30ff87927c9f2ed001602acc7bc3d42d4963802f4' 
  AND token = 'OdD67xxW6EfUCaimV0tA2TELutk5ya1xzOb5JR1TfKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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