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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34bc4f5465cfdfc505fb996c70a5e2977569075bddb3bbdaa9524db2f9aac23' 
  AND token = '/csIUNkKvLcQI5ytrUXZGk3MpGTa5r85TlUpPq60vBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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