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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc7e076984bae6590064fcac0f780c4c20e9c2180833ff6c11c25dcbebbe5c6' 
  AND token = 'N5futzGj6LNQIRmlzu94KyKQlhzkMdXH5kjovRCwCMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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