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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a331ef90f0d44d1e86fcf54d4c84da6bcd79da48966f2729fdbc2547ca575af' 
  AND token = 'zlb1SfpNb5Z3rxm/bsvNAPQnlso+KjM3r2SnCz7yNjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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