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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209f47ae0357d14081c5614c58f964d4b47084173f9034abd4ef7e48cc56a4fc' 
  AND token = 'YTnoYrPEomvJMRsO6yONvrEry/NrAdhl0XP+UHB5RVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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