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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fda836689b837cfba3aa3ff39f34fa24a568d533b6fd081c0e40ace8bf7885' 
  AND token = 'BMgd27TKuhACxPc1vQiebURSBkiINoS5swo6VCpRdJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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