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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07968463406453e4f25dc966c07cec046d2b0e2297726dfdd02410f67eb7c76' 
  AND token = 'BgVy9dSf/47bTbc+UKL1pRbe8vEh6KUg5SHxPa89ghU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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