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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba9587aaa4a5a9ac9c451d5a78421e3a4b793060278f4c5c1ddea02f7788a4a' 
  AND token = 'BBwvmyb2R5DBAYqUbIO2uWA+GH2kA0GJaW6SkctqEGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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