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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557f3255f566a9f21223c84d8dc5e968f56b9d5595329a07d2bb0d76900628ae' 
  AND token = 'lbOBd7xflrVYacVaNIfNTklDD2l6m3UaT+XrQUiBfdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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