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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd0dcd27df08fef921f8b903f0c1535d680c93be29a3b52f25e542d98e81974' 
  AND token = 't/TNvgIYjfdhoZ7PTlLexie1ePEAOEvm8fbQVdP/NhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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