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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c2b4a417075575da0a9626e973ca18c374440079e132e5404cd2880a674306' 
  AND token = 'focJa5dATEKpHRwvcyPUF3zSv6R5avme0R7ESh3qalU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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